<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <title>五线谱图例</title>

    <style>
        .pu {
            margin-top: 130px;
            margin-left: 30px;
            margin-right: 30px;
            margin-bottom: 30px;
        }

        .line {
            border-width: 2px;
            border-top-style: solid;
            border-bottom-style: solid;
            margin-top: 30px;
            margin-bottom: 30px;
        }

        .line-b {
            border-color: black;
        }

        .line-g {
            border-color: rgb(233, 233, 233);
        }
    </style>

</head>

<body>

    <div class="pu">

        <div class="line line-g"> </div>
        <div class="line line-g"> </div>
        <div class="line line-g"> </div>
        <div class="line line-g"> </div>
        <div class="line line-g"> </div>

        <div class="line line-b"> </div>
        <div class="line line-b"> </div>
        <div class="line line-b"> </div>
        <div class="line line-b"> </div>
        <div class="line line-b"> </div>

        <div class="line line-g"> </div>
        <div class="line line-g"> </div>
        <div class="line line-g"> </div>
        <div class="line line-g"> </div>
        <div class="line line-g"> </div>

    </div>

</body>

</html>